Not really worth it as far as tanking goes. Loremaster is still good. Shadowdancer can be good. Chronicler could be worth it if your DM supports your class abilities.
Starting at 4th level, you will already be rocking 2nd level spells.
If you get REALLY good stat rolls, I would look at druid//monk. Otherwise, PF gives a lot of love to the Paladin//Sorcerer. Consider a spell list including Light, True Strike, Feather Fall, Blindness. At 5th level, take Blur (or False life, if you go for Destined bloodline). This way, you are just a paladin, in normal heavy armor, who can cast save or sucks or true strikes (none of those spells have somatic components). At some point in the future, maybe level 6-8, you take off the armor and you instantly transform into a full sorcerer with good HP, BAB and saves.